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# MacAddress

`public final class MacAddress`
`extends Object` `implements Parcelable`

java.lang.Object
↳ | android.net.MacAddress

Representation of a MAC address. This class only supports 48 bits long addresses and does not support 64 bits long addresses. Instances of this class are immutable. This class provides implementations of hashCode() and equals() that make it suitable for use as keys in standard implementations of `Map`.

## Summary

### Constants
`int` | `TYPE_BROADCAST` Indicates a MAC address is the broadcast address.
`int` | `TYPE_MULTICAST` Indicates a MAC address is a multicast address.
`int` | `TYPE_UNICAST` Indicates a MAC address is a unicast address.

### Inherited constants
From interface `android.os.Parcelable`
`int` | `CONTENTS_FILE_DESCRIPTOR` Descriptor bit used with `describeContents()`: indicates that the Parcelable object's flattened representation includes a file descriptor.
`int` | `PARCELABLE_WRITE_RETURN_VALUE` Flag for use with `writeToParcel(Parcel, int)`: the object being written is a return value, that is the result of a function such as "`Parcelable someFunction()`", "`void someFunction(out Parcelable)`", or "`void someFunction(inout Parcelable)`".

### Fields
`public static final MacAddress` | `BROADCAST_ADDRESS` The MacAddress representing the unique broadcast MAC address.
`public static final Creator<MacAddress>` | `CREATOR`

### Public methods
`int` | `describeContents()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
`boolean` | `equals(Object o)` Indicates whether some other object is "equal to" this one.
`static MacAddress` | `fromBytes(byte[] addr)` Creates a MacAddress from the given byte array representation.
`static MacAddress` | `fromString(String addr)` Creates a MacAddress from the given String representation.
`int` | `getAddressType()` Returns the type of this address.
`Inet6Address` | `getLinkLocalIpv6FromEui48Mac()` Create a link-local Inet6Address from the MAC address.
`int` | `hashCode()` Returns a hash code value for the object.
`boolean` | `isLocallyAssigned()`
`boolean` | `matches(MacAddress baseAddress, MacAddress mask)` Checks if this MAC Address matches the provided range.
`byte[]` | `toByteArray()` Convert this MacAddress to a byte array.
`String` | `toOuiString()`
`String` | `toString()` Returns a human-readable representation of this MacAddress.
`void` | `writeToParcel(Parcel out, int flags)` Flatten this object in to a Parcel.

### Inherited methods
From class `java.lang.Object`
`Object` | `clone()` Creates and returns a copy of this object.
`boolean` | `equals(Object obj)` Indicates whether some other object is "equal to" this one.
`void` | `finalize()` Called by the garbage collector on an object when garbage collection determines that there are no more references to the object.
`final Class<?>` | `getClass()` Returns the runtime class of this `Object`.
`int` | `hashCode()` Returns a hash code value for the object.
`final void` | `notify()` Wakes up a single thread that is waiting on this object's monitor.
`final void` | `notifyAll()` Wakes up all threads that are waiting on this object's monitor.
`String` | `toString()` Returns a string representation of the object.
`final void` | `wait(long timeout, int nanos)` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object, or some other thread interrupts the current thread, or a certain amount of real time has elapsed.
`final void` | `wait(long timeout)` Causes the current thread to wait until either another thread invokes the `notify()` method or the `notifyAll()` method for this object, or a specified amount of time has elapsed.
`final void` | `wait()` Causes the current thread to wait until another thread invokes the `notify()` method or the `notifyAll()` method for this object.
From interface `android.os.Parcelable`
`abstract int` | `describeContents()` Describe the kinds of special objects contained in this Parcelable instance's marshaled representation.
`abstract void` | `writeToParcel(Parcel dest, int flags)` Flatten this object in to a Parcel.

## Constants

### TYPE_BROADCAST

    public static final int TYPE_BROADCAST

Indicates a MAC address is the broadcast address.

Constant Value: 3 (0x00000003)

### TYPE_MULTICAST

    public static final int TYPE_MULTICAST

Indicates a MAC address is a multicast address.

Constant Value: 2 (0x00000002)

### TYPE_UNICAST

    public static final int TYPE_UNICAST

Indicates a MAC address is a unicast address.

Constant Value: 1 (0x00000001)

## Fields

### BROADCAST_ADDRESS

    public static final MacAddress BROADCAST_ADDRESS

The MacAddress representing the unique broadcast MAC address.

### CREATOR

    public static final Creator<MacAddress> CREATOR

## Public methods

### describeContents

    public int describeContents ()

Describe the kinds of special objects contained in this Parcelable instance's marshaled representation. For example, if the object will include a file descriptor in the output of `writeToParcel(android.os.Parcel, int)`, the return value of this method must include the `CONTENTS_FILE_DESCRIPTOR` bit.

Returns
`int` | a bitmask indicating the set of special object types marshaled by this Parcelable object instance. Value is either `0` or `CONTENTS_FILE_DESCRIPTOR`

### equals

    public boolean equals (Object o)

Indicates whether some other object is "equal to" this one.

The `equals` method implements an equivalence relation on non-null object references:

- It is reflexive: for any non-null reference value `x`, `x.equals(x)` should return `true`.
- It is symmetric: for any non-null reference values `x` and `y`, `x.equals(y)` should return `true` if and only if `y.equals(x)` returns `true`.
- It is transitive: for any non-null reference values `x`, `y`, and `z`, if `x.equals(y)` returns `true` and `y.equals(z)` returns `true`, then `x.equals(z)` should return `true`.
- It is consistent: for any non-null reference values `x` and `y`, multiple invocations of `x.equals(y)` consistently return `true` or consistently return `false`, provided no information used in `equals` comparisons on the objects is modified.
- For any non-null reference value `x`, `x.equals(null)` should return `false`.

The `equals` method for class `Object` implements the most discriminating possible equivalence relation on objects; that is, for any non-null reference values `x` and `y`, this method returns `true` if and only if `x` and `y` refer to the same object (`x == y` has the value `true`).

Note that it is generally necessary to override the `hashCode` method whenever this method is overridden, so as to maintain the general contract for the `hashCode` method, which states that equal objects must have equal hash codes.

Parameters
`o` | `Object`: the reference object with which to compare.

Returns
`boolean` | `true` if this object is the same as the obj argument; `false` otherwise.

### fromBytes

    public static MacAddress fromBytes (byte[] addr)

Creates a MacAddress from the given byte array representation. A valid byte array representation for a MacAddress is a non-null array of length 6.

Parameters
`addr` | `byte`: a byte array representation of a MAC address. This value cannot be `null`.

Returns
`MacAddress` | the MacAddress corresponding to the given byte array representation.

Throws
`IllegalArgumentException` | if the given byte array is not a valid representation.

### fromString

    public static MacAddress fromString (String addr)

Creates a MacAddress from the given String representation. A valid String representation for a MacAddress is a series of 6 values in the range [0,ff] printed in hexadecimal and joined by ':' characters.

Parameters
`addr` | `String`: a String representation of a MAC address. This value cannot be `null`.

Returns
`MacAddress` | the MacAddress corresponding to the given String representation. This value cannot be `null`.

Throws
`IllegalArgumentException` | if the given String is not a valid representation.

### getAddressType

    public int getAddressType ()

Returns the type of this address.

Returns
`int` | the int constant representing the MAC address type of this MacAddress. Value is android.net.MacAddress.TYPE_UNKNOWN, `TYPE_UNICAST`, `TYPE_MULTICAST`, or `TYPE_BROADCAST`

### getLinkLocalIpv6FromEui48Mac

    public Inet6Address getLinkLocalIpv6FromEui48Mac ()

Create a link-local Inet6Address from the MAC address. The EUI-48 MAC address is converted to an EUI-64 MAC address per RFC 4291. The resulting EUI-64 is used to construct a link-local IPv6 address per RFC 4862.

Returns
`Inet6Address` | A link-local Inet6Address constructed from the MAC address. This value may be `null`.

### hashCode

    public int hashCode ()

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by `HashMap`.

The general contract of `hashCode` is:

- Whenever it is invoked on the same object more than once during an execution of a Java application, the `hashCode` method must consistently return the same integer, provided no information used in `equals` comparisons on the object is modified. This integer need not remain consistent from one execution of an application to another execution of the same application.
- If two objects are equal according to the `equals(Object)` method, then calling the `hashCode` method on each of the two objects must produce the same integer result.
- It is not required that if two objects are unequal according to the `equals(java.lang.Object)` method, then calling the `hashCode` method on each of the two objects must produce distinct integer results. However, the programmer should be aware that producing distinct integer results for unequal objects may improve the performance of hash tables.

As much as is reasonably practical, the hashCode method defined by class `Object` does return distinct integers for distinct objects. (This is typically implemented by converting the internal address of the object into an integer, but this implementation technique is not required by the Java™ programming language.)

Returns
`int` | a hash code value for this object.

### isLocallyAssigned

    public boolean isLocallyAssigned ()

Returns
`boolean` | true if this MacAddress is a locally assigned address.

### matches

    public boolean matches (MacAddress baseAddress,
                    MacAddress mask)

Checks if this MAC Address matches the provided range.

Parameters
`baseAddress` | `MacAddress`: MacAddress representing the base address to compare with. This value cannot be `null`.
`mask` | `MacAddress`: MacAddress representing the mask to use during comparison. This value cannot be `null`.

Returns
`boolean` | true if this MAC Address matches the given range.

### toByteArray

    public byte[] toByteArray ()

Convert this MacAddress to a byte array. The returned array is in network order. For example, if this MacAddress is 1:2:3:4:5:6, the returned array is [1, 2, 3, 4, 5, 6].

Returns
`byte[]` | a byte array representation of this MacAddress. This value cannot be `null`.

### toOuiString

    public String toOuiString ()

Returns
`String` | a String representation of the OUI part of this MacAddress made of 3 hexadecimal numbers in [0,ff] joined by ':' characters. This value cannot be `null`.

### toString

    public String toString ()

Returns a human-readable representation of this MacAddress. The exact format is implementation-dependent and should not be assumed to have any particular format.

Returns
`String` | This value cannot be `null`.

### writeToParcel

    public void writeToParcel (Parcel out,
                    int flags)

Flatten this object in to a Parcel.

Parameters
`out` | `Parcel`: The Parcel in which the object should be written.
`flags` | `int`: Additional flags about how the object should be written. May be 0 or `Parcelable.PARCELABLE_WRITE_RETURN_VALUE`. Value is either `0` or a combination of `Parcelable.PARCELABLE_WRITE_RETURN_VALUE`, and android.os.Parcelable.PARCELABLE_ELIDE_DUPLICATES

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